YouTube CEO Susan Wojcicki won't divulge her biggest fear about competing with Facebook, but she will give them some free advice.

"They should get back to baby pictures," Wojcicki said Monday at the Code Media conference in Huntington Beach, California. (By the way, Facebook's already aiming in that direction.)

Video has been an obsession for Facebook, as it tries to swipe the most advertising dollars migrating off television before YouTube can get them. Facebook has been aggressively advancing the number of clips and live streams that bubble up to the top of your News Feed and has rolled out a central hub for TV-like programming called Watch.

"You always have to take competition seriously. You don't win by looking backwards; you win by looking at your customers and looking forward," she said.

Facebook didn't respond to a message seeking comment.

Also, Wojcicki said YouTube planned on Tuesday to roll out its Red subscription tier much wider internationally to about 100 countries, from the five where it operates now.

She also explained the rational behind allowing stars like Logan Paul -- a digital star under fire for posting offensive videos to YouTube including one showing a suicide victim -- to stay on the service. YouTube has a three-strikes rule, she said. That means creators can have their accounts terminated for three infractions against YouTube's official policies. Paul hasn't hit three strikes, Wojcicki said, noting it's important for the company to enforce its rules consistently.